wrapping text around image

The codex is not helping me get this figured out. I can insert an image, but when I select the left alignment radio button the text is underneath. What I read below on your site didn’t make sense as to what to do:

Current versions of WordPress now have image alignment built-in. WordPress adds CSS classes to align the image to the right, left, and center of a paragraph, so the text will wrap around the image.

In order to take advantage of these new CSS classes for image alignment and the text wrapping around the image, the WordPress Theme must include the following in the style.css found in the WordPress Theme directory.

img.alignright {float:right; margin:0 0 1em 1em}
img.alignleft {float:left; margin:0 1em 1em 0}
img.aligncenter {display: block; margin-left: auto; margin-right: auto}
a img.alignright {float:right; margin:0 0 1em 1em}
a img.alignleft {float:left; margin:0 1em 1em 0}
a img.aligncenter {display: block; margin-left: auto; margin-right: auto}

My website is https://www.timothycward.com
My post is https://timothycward.com/?p=110
When I edit the post, the text looks like:
<img src=”https://timothycward.com/wp-content/uploads/2010/08/51tXm7l6DKL._SX75_1.jpg&#8221; alt=”” title=”51tXm7l6DKL._SX75_” width=”75″ height=”113″ class=”alignleft size-full wp-image-138″ />

Invasive Procedures is a science fiction thriller where Dr. Frank Hartman…